Initial backend/frontend structure

Author: DidacSF

.gitignore

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+.DS_Store
+.env

README.md

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 # sage-playground
+
 Your playground to get started with the Substrate Asset Gaming Framework (SAGE)
+
+## Backend Quickstart
+
+To quickly launch a testing node:
+
+```sh
+cd backend
+cargo build-sage-node
+./target/release/sage-playground-node --dev
+```
+
+Check [here](/backend/README.md) for more details on the backend.
+
+## Frontend Quickstart
+
+To run the frontend:
+
+```sh
+cd frontend
+pnpm i
+pnpm dev
+```
+
+Make sure the node is running so the connection works.
+
+Check [here](/frontend/README.md) for more details on the frontend.

backend/.cargo/config.toml

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+[alias]
+build-sage-node            = "build --release --no-default-features --bin sage-playground-node"
+build-sage-node-benchmarks = [ "build-sage-node", "--features", "runtime-benchmarks" ]
+
+[target.'cfg(feature = "cargo-clippy")']
+rustflags = [
+    "-Aclippy::derive_partial_eq_without_eq",
+    "-Aclippy::too_many_arguments",
+    "-Aclippy::type_complexity",
+    "-Aclippy::uninlined-format-args",
+    "-Aclippy::unnecessary_cast",
+    "-Aclippy::large_enum_variant",
+]

backend/.cargo/zepter.yaml

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+version:
+  format: 1
+  # Minimum version of the binary that is expected to work. This is just for printing a nice error
+  # message when someone tries to use an older version.
+  binary: 0.13.2
+
+# The examples in this file assume crate `A` to have a dependency on crate `B`.
+workflows:
+  check:
+    - [
+      'lint',
+      # Check that `A` activates the features of `B`.
+      'propagate-feature',
+      # These are the features to check:
+      '--features=try-runtime,runtime-benchmarks,std',
+      # Do not try to add a new section into `[features]` of `A` only because `B` expose that feature. There are edge-cases where this is still needed, but we can add them manually.
+      '--left-side-feature-missing=ignore',
+      # Ignore the case that `A` it outside of the workspace. Otherwise it will report errors in external dependencies that we have no influence on.
+      '--left-side-outside-workspace=ignore',
+      # Some features imply that they activate a specific dependency as non-optional. Otherwise the default behaviour with a `?` is used.
+      '--feature-enables-dep=try-runtime:frame-try-runtime,runtime-benchmarks:frame-benchmarking',
+      # Auxillary flags:
+      '--offline',
+      '--locked',
+      '--show-path',
+      '--quiet',
+    ]
+  # Same as `check`, but with the `--fix` flag.
+  default:
+    - [ $check.0, '--fix' ]
+
+# Will be displayed when any workflow fails:
+help:
+  text: |
+    This repo uses the Zepter CLI to detect abnormalities in the feature configuration.
+    It looks like one more more checks failed; please check the console output. You can try to automatically address them by running `zepter`.
+    Otherwise please ask directly in the Merge Request, GitHub Discussions or on Matrix Chat, thank you.
+  links:
+    - "https://github.com/ggwpez/zepter"

backend/.gitignore

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+## File system
+.DS_Store
+desktop.ini
+
+## Editor
+*.swp
+*.swo
+Session.vim
+.cproject
+.idea
+*.iml
+.vscode
+.project
+.favorites.json
+.settings/
+.vs/
+
+## Tool
+.valgrindrc
+# Included because it is part of the test case
+!/tests/run-make/thumb-none-qemu/example/.cargo
+
+## Configuration
+/config.toml
+/Makefile
+config.mk
+config.stamp
+no_llvm_build
+
+## Build
+/dl/
+/doc/
+build/
+/dist/
+/target
+
+# Before adding new lines, see the comment at the top.